Experimentally obtained TGA data on paddy husk and cellulose has been correlated using a two stage model. The data correlation is highly sensitive to the choice of the stage transition point. The effect of different stage transition points on the kinetic parameters is examined in this paper and an optimum stage transition point identified. The technique has also been tested on earlier published data and found to give satisfactory results. The systematic choice of the stage transition point should lead to greater uniformity and reliability in reported kinetic data